code: def is_buffered_reader(file: object):
      return not isinstance(file, luigi.contrib.s3.ReadableS3File)
  
file_path: gokart/gokart/object_storage.py
imports: from datetime import datetime
  import luigi
  import luigi.contrib.gcs
  import luigi.contrib.s3
  from luigi.format import Format
  from gokart.gcs_config import GCSConfig
  from gokart.gcs_zip_client import GCSZipClient
  from gokart.s3_config import S3Config
  from gokart.s3_zip_client import S3ZipClient
  from gokart.zip_client import ZipClient
label_desc: Use image node_id 6 for calling the ObjectStorage obj's underlying member method code with example usage: obj.is_buffered_reader(file) and returns: unknown